C ++ ape's Python note 01

Annotation prefix # 

# ! /Usr/bin/Python
# Filename: helloworld. py
Print   ' Hello python. '

String

1. 'is the same"

2. ''' is used to define multi-line strings and can be used freely. 'And"

>>>   Print   ''' This is a multi-line string. This is 1st line.
This is Second line.
"What's ur name? ", I asked.
"My name is fourth line! ". '''
This Is A Multi - Line string. This Is 1st line.
This Is Second line.
" What's ur name? " , I asked.
" My name is fourth line! " .

>>>

3. Escape Character \

4. Natural string prefix, R or R

Natural string: a string that does not recognize escape characters.

5. Unicode string prefix, U or U

6. The string that is put together will automatically Cascade

7. Separate output content, similar to cascade, but a space is automatically added

>>>   Print   ' This is '   " A sentence. "
This isa sentence.
>>>   Print   ' This is ' , " A sentence. "

ThisIsA sentence. 

 

Separate statements

Or the end of a physical row to indicate the end of a statement.

However, the semicolon is usually not seen in Py;

I =   5
Print I

I= 5;PrintI

I= 5;PrintI;

I= 5;
PrintI;

 

ProgramBlock Division

Use indentation to represent the program hierarchy

RecommendedSingle TabOrTwo or four spaces 

Operator

1. **, power, X ** y, returns the Y Power of X.

2. //, division. Returns the integer part of the operator.

3 .~, Flip by bit ,~ X returns-(x + 1 ),~ 5.

4. Not, And, Or, logical operators.